Short answer, yes you can do worries, the power supply is more than enough too.
Slightly longer answer, the connections on the TVs will dictate if you need to buy any additional convertors, most likely you'll need a DVI to HDMI.
A 560 won't even be tickled pushing out 2 2D 1920x1080 feeds. The size of the TV will have no effect these days as unless you're buying an XD TV they are all going to be 1920x1080, I personally have 2 24" monitors connected to a GTX460 running 1920x1200 with no issues what-so-ever (the fact I have a second in SLI is redundant as that's only used for 3D rendering and you'll be pushing 2D).
The only time you might notice a pull on the cards is if you want to send a h.264 stream which will be hardware accelerated by the card, even then you've got a CPU that can easily cope with it.